JPS62121914A - Magnetic head - Google Patents

Abstract

PURPOSE:To eliminate such a trouble that a core and sliders peel off due to the difference between expansion coefficients by integrally forming the core and the sliders positioned at its both sides so as to hold the core with the same material. CONSTITUTION:The titled head has a read/write core 22, an intermediate core, an erasure core 32, all of which are integrally equipped with slider parts 21, 23, 31 and 33 made of the same material. They are taken for a read/write core unit 2, an intermediate core unit 4 and an erasure core unit 3 and laminated in that order. A read/write gap 91 is installed on the butted surface of the read/write core 33 and the intermediate core 42, while erasure gaps 95 and 96 are installed on the butted surface of the intermediate core and the erasure core 32. Thus the step sticking the core to the slider can be omitted to simplify assembly process, and moreover gap depth can be easily measured.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a magnetic head, and particularly to a tunnel erase type floppy head.

Prior art and its problems For example, magnetic hesedo for recording, reproducing, and erasing information on flexible recording media has its shape optimized to suit each company's drive, and various types have been proposed. . In this case, the basic characteristics required are almost the same, but recently, especially recording density,
With the increase in track density and the compactness of flexible recording media, there is a strong demand for higher output by increasing the magnetic efficiency of magnetic heads, miniaturization, and simplified assembly processes.

An example of a conventional magnetic head structure is shown in FIG. 6. This is a tunnel erase type magnetic head usually called a bulk type.

In this case, the read/write core 22 and the read/write intermediate core 412 are formed by butting together half-core blocks made of a material such as ferrite, and have a read/write gap 91 on the front surface that slides into contact with the magnetic recording medium. .

The read/write gap 91 has nonmagnetic material filling portions 911 and 912 at both ends on the outside in the track width direction, and these nonmagnetic material filling portions 911 and 912 determine the track width of the read/write gap. It is something to do.

A read/write head including the non-magnetic material filling portions 911 and 912 is constructed by butting the core halves with grooves formed on their front surfaces to determine the gear width, and then filling the grooves with a non-magnetic filler such as glass. It is created by

A winding 81 is provided on the side core portion 25 of this read/write head.

Also, erase core 32. The erase intermediate core 452 is
It is also made of a material such as ferrite, and has an erase gap of 95.96 on the front surface that makes sliding contact with the magnetic recording medium.

The erase gaps 95 and 96 are located in a substantially symmetrical position across the non-magnetic material filled portion 951 in the center.

The width of this non-magnetic material filling portion 951 is usually approximately the same as the width of the read/write gap 91 described above. The track width of the erase gap is 9511.
2.

The erase head including the nonmagnetic material filling portions 951, 9511, and 9512 is made by abutting half cores each having a groove formed on the front surface, and then filling the cores with a nonmagnetic filler.

Further, a winding 85 is provided on the side core portion 35 of this erase head.

The read/write intermediate core 412 and the erase intermediate core 452 are integrated via the insulating layer 5, and both longitudinal surfaces thereof are further sandwiched and fixed by sliders 15 and 16.

Such conventional magnetic heads have various disadvantages.

In particular, when adhesively fixing a slider and a core made of different materials, it is necessary to match the expansion coefficients of the two, which increases the number of steps for adhesively fixing, and causes problems such as peeling accidents between the slider and the core.

In addition, in conventional magnetic heads, the core thickness has been reduced to 200 mm due to processing techniques such as cutting and polishing the core, or from the viewpoint of magnetic interference between the read/write core and the erase core due to magnetic saturation.
It is difficult to make it less than gm. Furthermore, considering the thickness of the adhesive layer between cores, etc., it is difficult to reduce the distance between the read/write gap and the erase gap to 500 Bm or less, which hinders high recording density.

■ Purpose of the Invention The purpose of the present invention is to have good assembly accuracy, simple processes, and excellent durability during use, and to be able to perform stable recording and reproduction in a timely manner even at high recording densities. It is an object of the present invention to provide a magnetic head with little magnetic interference between a write core and an erase core, no decrease in track size due to tunnel erase, and a large off-track margin.

■Disclosure of invention These objects are achieved by the invention described below.

That is, the present invention has a read/write core, an intermediate core, and an erase core, each of which is integrally provided with a slider portion made of the same material, and a read/write core unit, respectively.
An intermediate core unit and an erase core unit are formed, each of these core units is stacked in this order, a read/write gap is provided on the abutting surface between the read/write core and the intermediate core, and an erase is formed on the abutting surface between the intermediate core and the erase core. This is a magnetic head characterized by being provided with a cap.

■Specific structure of the invention Hereinafter, a specific configuration of the present invention will be explained in detail.

1 to 4 show an embodiment of the present invention for a so-called bulk type magnetic head.

In this case, the magnetic helad 1 of the present invention is formed by laminating and integrating a read/write core unit 2, an intermediate core unit 4, and an erase core unit 3 in this order.

The read/write core unit 2 is made of a material such as ferrite and has a read/write core base 20 with read/write slider parts 21 and 23 integrally formed on both sides of the read/write core 22. A medium sliding contact surface is formed on one surface of the read/write core base 20.

Further, this base portion 20 includes a read/write core side portion 221 that protrudes and connects to the side opposite to the sliding surface with the magnetic recording medium. Read/write slider side parts 211, 23
1 is provided integrally. Normally, the read/write core side part 221 is the read/write slider side part 211.
．． In the present invention, this read/write slider side portion 211.231 is preferably longer than 231.
Although it is not necessary to provide this, the mechanical strength of the head is improved.

Further, the read/write core unit 2 has a convex portion 291 for forming a read/write gap on the abutting surface of the read/write core group fm2o with the intermediate core unit 4. In this case, the protrusion 291 may not be provided on the read/write core unit 2, but may be provided only on the intermediate core unit 4 (described later), or may be provided on both. Dimensional accuracy (read/write track width accuracy) is improved.

The intermediate core unit 7 4 is made of a material such as ferrite, and has an intermediate core base 40 formed by integrally molding intermediate sliders i41 and 43 on both sides of the intermediate core 42, and the side opposite to the sliding contact surface between the magnetic recording medium and the intermediate core base 40. Intermediate core side portion 42 protruding from
1. The intermediate slider side portions 411 and 431 are integrally provided. Further, the intermediate core 42 has convex portions 495 and 496 for forming an erase gap on the side of the surface that abuts against the erase core unit 3. Usually, the intermediate core unit 4 is preferably made of the same material as the read/write core unit 2.

As shown in FIGS. 1 and 2, the abutting surfaces of the read/write core unit 2 and the intermediate core unit 4 are provided with a gap of 0.3 to 2 by the convex portion 291.
End ■, track [mouth 0.06~0.3-Peng, gap depth 10~Ioo, read/write gap 91 of ■
Then, the non-magnetic material filled portions 611 and 613 of the abutting surfaces of the read/write core unit 2 and the intermediate core unit 4
They may be integrated by filling them with a non-magnetic filler such as glass.

The read/write core base 20 has a thickness of about 0.5 to 1.5 mm, a length of about 3.0 to 5.0 mm in the track+lJ direction, and a length of about 5.0 to 6.0 mm in the medium running direction. It has a flat plate shape.

The read/write core side part 221 has a height of 3.5 to 4.5
The length in the track width direction is about 0.2 to 0.5 m, and the length in the medium running direction is about 0.5 to 1.51 m.

Also, read/write slider side part 211.231
have a height of about 1.8 to 3.0 mm, a length of about 0.5 to 2.0 mm in the direction of the truck 111, and a length of about 0.5 to 1.5 mm in the medium running direction, respectively. be.

The read/write core side portion 221 of the read/write core unit 2 is provided with a read/write radius of 100 to 300 turns x 2.

In other words, the coil dimensions are 2 to 5 mm in diameter, 1112 mm.
It should be about 5 yen.

Further, as shown in FIG. 4, a back par 71 may be provided between the read/write core side part 221 and the intermediate core side part 421 to form a closed magnetic path.The material of the back par 71 is lead. Light core unit 2. It may be the same as the intermediate core unit 4.

In this case, the read/write head winding 81 is not necessarily provided on the read/write core side portion 221 but may be provided on the back par 71.

The intermediate core base 40 has a medium sliding contact surface that uniformly connects with the read/write core base 20, has approximately the same thickness and length in the track width direction as the read/write core base 20, and has a media sliding surface that is uniformly connected to the read/write core base 20. The length is about 0.3 to 1.0■■.

Further, the heights of the intermediate core side portion 421 and the intermediate slider side portions 411 and 431 are the same.

Gap 11] The length in the direction is the read/write core side part 221 and the read/write slider side part 211.
．． 231, and the length in the medium running direction is 0.3 to 1. It is approximately Os+s.

Although it is preferable to provide the intermediate slider side portions 411 and 431 in order to improve mechanical strength, they may be omitted if necessary.

The erase core unit 3 is made of a material such as ferrite, and has erase slider sections 31 on both sides of the erase core 32.
．． an erase core base 30 provided by integrally molding 33;
Erase core side portion 321 protruding on the side opposite to the sliding surface with the magnetic recording medium. Erase slider side part 31
1.331 are provided integrally.

Normally, it is preferable that the erase core side portion 321 is longer than the erase slider side portions 311 and 331.

The erase core base 30 has a medium sliding contact surface that uniformly connects with the read/write core base 20 and the intermediate core base 40.

In addition, the erase core unit 3 includes an erase core base 3
It has convex portions 395 and 396 for forming an erase gap on the abutting surface with the erase intermediate core unit 4 of No. 0.

And as shown in FIGS. 1 and 2.

The abutting surfaces of the erase core unit 3 and the intermediate core unit 4 have convex portions 495, 496° and 395.396 abutting surfaces to form gaps 1 to 6 and a track width of 5.
oN150IL Crow.

Gap depth: 20 to 200 It has two erase gaps of about 95.96 mm.

There may be only one erase gap, unlike the illustration.

Then, erase core unit 3 and intermediate core unit 4
Non-magnetic material filled portions 651, 652, 6 on the abutting surface with
53 may be filled with a non-magnetic filler such as glass to integrate them.

The erase core base 30 has a thickness of about 0.5 to 1.5 seconds, a length of track II 3 in the force direction of about 3.0 to 5.0 mm,
It has a flat plate shape with a length of about 5.0 to 6.0 mm in the medium running direction.

The erase core side part 321 has a height of 3.5 to 4.5 m.
Layer level, length in track 111 direction 0.2-0.5mm
The length in the medium running direction is about 0.5 to 1.5 mm.

The erase slider side portions 311 and 332 each have a height of approximately 1.8 to 3.0 mm and a length of 0.5 to 2.0 mm in the direction of the track 11. The length in the medium running direction is approximately 0.5 to 1.5 mm.

Further, the erase core side portion 321 of the erase core unit 3 is provided with a winding 85 for the erase head.

The number of windings is usually about 20 to 100 turns.

In other words, the diameter of the winding coil is 2 to 5 cm and 1.1 cm.
It is about 112 to 5 meters long.

Further, as shown in FIG. 4, a back par 75 may be provided between the erase core side part 321 and the intermediate core side part 421, and a closed magnetic path may be formed. (Erase core unit) 3 may be the same as the intermediate core unit 4.

In this case, the erase head winding 85 is not necessarily provided on the erase core side portion 321 but may be provided on the back par 75.

In addition, in this case as well, the erase slider side portion 311
．． 331 may be omitted if necessary.

In addition, the convex portion for forming the gap is the erase core 3,
It may be formed only on one side of the intermediate core 4.

Furthermore, as shown in the figure, the bottom sides of the read/write core 2 and the erase core 3 that are connected to the gap abutting surfaces are tapered, and the non-magnetic material filling part in the gap depth direction of the read/write gap 91 and the erase gap 95° 96 is made tapered. It is preferable to provide a so-called apex.

After each unit is fixedly connected as described above, the sliding surface is usually polished, winding is applied, and a backper is connected as necessary.

In the integrated magnetic head of the present invention, the so-called core and the slider positioned to sandwich both sides of the core are integrally molded of the same material, so the process is simple and the strength is extremely high. It is expensive.

Further, in the illustrated example, grooves 10 are formed perpendicular to the track width direction on the sliding surface of the magnetic recording medium to ensure running stability of the magnetic recording medium. Groove lO has depth 0
．． It is about 2 to 1.0■■, and about 100.2 to 1.5 m.

Using such a magnetic head, a so-called gimbal-type magnetic head and a so-called button-type, T-type, or other fixed type magnetic head can be produced.

In the gimbal type magnetic head, as shown in Fig. 5,
The gimbal plate 11 is fixedly bonded to the magnetic head so as to protect the read/write head winding 81 and the erase head winding 85.

Such a magnetic head of the present invention can effectively exhibit its excellent characteristics as a floppy head.

■Specific effects of the invention The magnetic head of the present invention exhibits the following effects.

(1) In the magnetic head of the present invention, the so-called core and the sliders positioned on both sides of the core to sandwich the core are integrally molded of the same material. 'Af! between the core and the slider due to the difference in expansion coefficient of the slider material! ＃It is a magnetic head with excellent durability and no defects.

(2) Also, the adhesion process between the core and the slider JL? /
ThIJL! x-, 14a+ Jy 〒
(n ＾ 連”kL le at rx ahi +v
'Et 4 will occur.

(3) In addition, conventionally, it was difficult to measure the gap depth by laminating the slider.
In the magnetic head of the present invention, the gap depth can be easily measured even after manufacturing, and therefore the product can be stabilized.

(4) Furthermore, when adjusting the azimuth when attaching the magnetic head to the carriage, in the conventional magnetic head, it had to be adjusted using the extremely small distance #l range of track IIJ of the read/write gap. In the magnetic head of the present invention, the entire magnetic head 111 including the slider serves as a read/write gap formation reference line, and the positioning reference line is several tens of tens of meters from the track 111.
Since it is twice as large, azimuth adjustment becomes extremely easy and highly accurate.

(5) The magnetic head of the present invention includes a read/write core unit 2, an intermediate core unit 4. This is a three-block magnetic head consisting of an erase core unit 3 and an erase core unit 3, and unlike conventional magnetic heads, the intermediate core unit 4 serves as the side core of the read/write head and the erase head, and no insulating layer is provided.

Therefore, the distance between the read/write gap 91 and the erase gap 95,96 can be significantly reduced.

(6) Therefore, even if the recording density increases, recording and reproduction can be performed using the conventional track format under the same timing conditions, and compatibility with conventional information can be maintained.

[Brief explanation of drawings]

FIG. 1 is a perspective view from the top side of a bulk type magnetic head as an embodiment of the present invention, and FIG. 2 is a partially enlarged view of the top surface. FIG. 3 is a perspective view from the top side of a component of a bulk type magnetic head as an embodiment of the present invention, and FIG. 4 is a perspective view from the bottom side after integration. FIG. 5 is a perspective view of a gimbal type magnetic head using the head shown in FIG. FIG. 6 is a perspective view of a bulk type magnetic head as an example of the prior art. Explanation of symbols 1...Magnetic head, 2...Read/write core unit, 20...Read/write core base. 22... Read/write core, 21.23/Read/write slider section, 3... Erase core unit,
30... Erase core base, 32... Erase core, 31.33... Erase slider section, 4... Intermediate core unit. 40... Intermediate core base, 42... Intermediate core, 41.
43...Intermediate slider section. 611.613, 651.652, 653... Non-magnetic material filling part, 71.75... Back bar, 81... Winding wire for read/write head. 85... Erase head winding, 91... Read/write gap, 95.96... Erase gap, 10... Groove, 1
1... Gimbal, 15. 16... Slider applicant TDC Corporation - 4 FIG, 2 FIG, 5

Claims (2)

[Claims] (1) It has a read/write core, an intermediate core, and an erase core, each of which is integrally provided with a slider portion made of the same material to form a read/write core unit, an intermediate core unit, and an erase core unit, and each of these core units is A magnetic head characterized in that the layers are laminated in this order, and a read/write gap is provided at the abutting surface between the read/write core and the intermediate core, and an erase gap is provided at the abutting surface between the intermediate core and the erase core. (2) The magnetic head according to claim 1, wherein each core unit is integrally molded.